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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e304cea90ce38e84360c35b880ebeceda3fbfe9c6cc6a01dbaaf815ab28f8a1e' 
  AND token = '3i49Vkj4MjNqATl8gQCYPnKkK/XUA0ePOXsnCBdLb8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}